Post on 01-Nov-2019
SENSING ODOUR WITH E-NOSE
The past and future trends of odour detection
By Christine Thuen
AGENDA
Sensors
Electronic nose
What is electronic nose?
Application areas
Wireless Sensor Networks Based Electronic-nose used
for monitoring and improving air quality
Challenges and possible solutions
Future trends
Conclusion
SENSORS
Considered as
Transducers --> converts a signal or data from one form
to another
Intelligent proactive devices part of a larger system
bringing layer of control over human capabilities
HUMAN SENSORY SYSTEM
Seeing (Camera)
Hearing (Microphone)
Tasting (E-tounge)
Touch (Thermometer)
Smell (E-nose)
GAS DETECTION METHODS
Different excisting gas detection methods such as
Gas chromatography (GC)
Mass spectrometry (MS)
GC-MS Method
Ion mobility spectrometry (IMS)
Near-Infrared spectroscopy
ELECTRONIC NOSE
First E-nose device made in the1980s
A smart instrument designed to detect and
distinguish complex odours
COMPARING THE BIOLOGICAL NOSE TO THE E-
NOSE
E nose is compared to the olfactory
system
Human loungs pump
Biological detecing gas sensors
detecting gas
Olfactory system performs pattern
recognition artificial nose uses a
intelligent pattern classification algorithm
COMPARING THE BIOLOGICAL NOSE TO THE E-
NOSE
ELECTRONIC NOSE
Typical E-nose device includes
a sampling system
an array of chemical gas sensors
a analog to digital converter (ADC)
a computer microprocessor with sample classification
method (pattern-classification algorithm)
APPLICATIONS
E-NOSE DEVICES
SensorFreshQ
Cyranose 320
JPL Electronic Nose
SensorFreshQ
Cyranose 320
JPL Electronic Nose
WIRELESS SENSOR NETWORKS BASED ELECTRONIC-NOSE USED
FOR MONITORING AND IMPROVING AIR QUALITY
o Using a fuzzy neural network based on RBF algorithm
o Using ZigBee which enables low complexity and ultra low
power consumption.
CHALLANGES WITH CURRENT E-NOSE
High cost
Complexity of signature detection and matching
To broad range of application area
e.g Cyranose 320 used to sniff out explosives,
chemicals, food contaminates and even cancers.
POSSIBLE SOLUTIONS
E-Nose that are more targetable at detecting and
discriminating a small range of analytes
Printed organic conductors
FUTURE TRENDS
Current price of e nose same as in 1998 (from
$5000 – $100 000)
Experts predict that within a decade e-noses will
cost only tens of dollars
CONCLUSION
QUESTIONS?